منابع مشابه
Osse and Rxte Observations of Grs 1915+105: Evidence for Non-thermal Comptonization
GRS 1915+105 was observed by the CGRO/OSSE 9 times in 1995-2000, and 8 of those observations were simultaneous with those by RXTE. We present an analysis of all of the OSSE data and of two RXTE-OSSE spectra with the lowest and highest X-ray fluxes. The OSSE data show a power-law–like spectrum extending up to & 600 keV without any break. We interpret this emission as strong evidence for the pres...
متن کاملQuasi–Thermal Comptonization and GRBs
Quasi–thermal Comptonization is an attractive alternative to the synchrotron process to explain the spectra of GRBs, even if we maintain other important properties of the internal shock scenario, implying a compact emitting region and an equipartition magnetic field. Photon–photon absorption and electron–positron pairs can play a crucial role: this process may lock the effective temperature in ...
متن کاملQuasi–thermal Comptonization and gamma–ray bursts
Quasi–thermal Comptonization in internal shocks formed between relativistic shells can account for the high energy emission of gamma–ray bursts. This is in fact the dominant cooling mechanism if the typical energy of the emitting particles is achieved either through the balance between heating and cooling or as a result of electron–positron pair production. Both processes yield sub or mildly re...
متن کاملA Comptonization Model for Phase Lag Variability in Grs 1915+105
In this Letter we propose a simple thermal comptonization model to account for the observed properties of the phase lags associated to the “plateau” intervals of GRS 1915+105. By invoking a temperature stratification in a corona and assuming that the optical depth of the comptonizing region increases as the disk inner radius moves inward, we are able to reproduce both the observed colors and ti...
متن کاملThermal and Bulk Comptonization in Accretion-powered X-ray Pulsars
We develop a new theoretical model for the spectral formation process in accretion-powered X-ray pulsars based on a detailed treatment of the bulk and thermal Comptonization occurring in the accreting, shocked gas. A rigorous eigenfunction expansion method is employed to obtain the analytical solution for the Green’s function describing the scattering of radiation injected into the column from ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2001
ISSN: 0004-637X
DOI: 10.1086/320489